<br />mysql> SELECT something FROM table<br /> WHERE TO_DAYS(NOW()) - TO_DAYS(date_col) <= 30;<br /><br />from:<font color="#ff0000"><a href="http://linux.tnc.edu.tw/techdoc/mysql/mysql_doc/manual_Reference.html#Date_and_time_functions">MySQL中文參考手冊:7.4.11 日期和時間函數</a></font><!-- more -->